#!/bin/bash
#s1
function s1_generate_a_series_of_files(){
  for index in {1..100}; do
  echo $index >/tmp/new_file$index
  done
}
function s2_list_4_files_in_long_format_about_account_and_group(){
   ls -l /etc/{passwd,shadow,group,gshadow} | sort -d
}
function s3_find_items_related_to_given_username(){
   grep -h $1 /etc/{passwd, shadow} | sort -d
}
function s4_find_items_related_to_given_group_name(){
  groupname=$1
  grep -E "^$groupname:" /etc/group /etc/gshadow | sort
}
function s5_create_groups_for_given_group_names(){
 group_names=("rnd"  "itoperation")
 for group in "${group_names[@]}"; do
 groupadd $group
 done 
}
function s6_create_users_and_set_their_group_as_required(){
   useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward
}
function s7_change_users_shell(){
  usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward
}
function s8_set_password_change_policy(){
  passwd -n 10 -x 60 -w 10 adam
  passwd -n 10 -x 60 -w 10 bob
  passwd -n 10 -x 60 -w 10 david
  passwd -n 10 -x 60 -w 10 calvin
  passwd -n 10 -x 60 -w 10 edward
}
function s9_set_password_for_five_users(){
  passwords=("$1" "$2" "$3" "$4" "$5")
  usernames=("adam" "bob" "calvin" "david" "edward")
local chpass_input" "
  for i in $(seq 0 4 ); do
   echo "${usernames[$i]}:!${passwds[$i]}" | sudo chpasswd
   done 
}
function s10_lock_bobs_password(){
   sudo usermod --lock bob
}
function s11_include_adam_into_wheel_group(){
     sudo usermod -aG wheel adam
}
function s12_chang_files_permission(){
  for index in $(seq 3 3 99); do
     sudo chomd 640 /tmp/new_file$index
  done
}
